# radiation
## English
### Etymology

Borrowed from Latin radiatio, radiationis. By surface analysis, radiate +‎ -ion.

### Pronunciation

* (UK, US, Canada) IPA: /ˌɹeɪ.diˈeɪ.ʃən/
** Audio (London):(file)
** Audio (Southern England):(file)
** Audio (Texas):(file)
* (General Australian) IPA: /ˌɹæɪ.diˈæɪ.ʃən/
* (some Ghanaian speakers) IPA: /ɹæ.diˈeɪ.ʃən/

### Noun

radiation (countable and uncountable, plural radiations)
* The shooting forth of anything from a point or surface, like diverging rays of light.
    heat radiation
* The process of radiating waves or particles.
* The transfer of energy via radiation.
    Coordinate terms: convection, conduction
* Radioactive energy.
** 1986, "Weird Al" Yankovic (lyrics and music), “Christmas at Ground Zero”, in Polka Party!‎:It's Christmas at ground zero / And if the radiation level's OK / I'll go out with you / To see all the new / Mutations on New Year's Day
* (evolutionary theory, countable) A rapid diversification of an ancestral species into many new forms.
** 2014, Elizabeth Kolbert, chapter 8, in The Sixth Extinction: An Unnatural History, Henry Holt and Company:So the question is: have plants and animals retained over this huge amount of time—whole radiations of mammals have come and gone in this period—have they retained these potentially costly characteristics?
** 2016, Donald R. Prothero, The Princeton Field Guide to Prehistoric Mammals, page 136:The second [canid group] is the radiation of dogs in South America that began when the first canids arrived about 3 Ma, after crossing the Panama land bridge (Fig. 5.4).

#### Derived terms

* acute radiation syndrome
* adaptive radiation
* alpha radiation
* Askaryan radiation
* background radiation
* background radiation equivalent time
* beta radiation
* broadcast radiation
* Cerenkov radiation
* Cherenkov radiation
* cosmic background radiation
* cosmic radiation
* electromagnetic radiation
* gamma radiation
* gravitational radiation
* Hawking radiation
* infrared radiation
* infrared radiation
* ionising radiation
* ionizing radiation
* medium-wavelength infrared radiation
* microwave-radiation
* microwave radiation
* neutron radiation
* non-ionizing radiation
* nuclear radiation
* radiation belt
* radiation biology
* radiation chemistry
* radiation damage
* radiation dose
* radiation fog
* radiation hardening
* radiation impedance
* radiation lampshade
* radiation physics
* radiation poisoning
* radiation pressure
* radiation pyrometer
* radiation resistance
* radiation shielding
* radiation sickness
* radiation therapy
* solar radiation
* submillimeter wave radiation
* synchrotron radiation
* terahertz radiation
* thermal radiation
* thermal radiation
* ultraviolet radiation
* UV radiation
* Van Allen radiation belt
* x-radiation
* X-radiation
* X-ray radiation

#### Related terms

* radiate
* radiative

#### Translations

    The translations below need to be checked and inserted above into the appropriate translation tables. See instructions at Wiktionary:Entry layout § Translations.

### See also

* nucleomitophobia

### Anagrams

* antiradio

## French
### Etymology

Borrowed from Latin radiātiōnem.

### Pronunciation

* IPA: /ʁa.dja.sjɔ̃/
* Audio:(file)

### Noun

radiation f (plural radiations)
* radiation (all meanings)

#### Derived terms

* ceinture de radiations de Van Allen

#### Related terms

* radier

#### Descendants

* → Romanian: radiație
* → Turkish: radyasyon

### Further reading

* “radiation”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.